radeonsi: unify disk cache id no matter use_aco or not

Which compiler shader is compiled with could be distinguished
with nir->info.use_aco_amd now, so no need to separate disk
cache id for them.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32742>

src/gallium/drivers/radeonsi/si_pipe.c

@@ -1112,13 +1112,8 @@ static void si_disk_cache_create(struct si_screen *sscreen)
    if (!disk_cache_get_function_identifier(si_disk_cache_create, &ctx))
       return;
 
-   /* ACO and LLVM shader binary have different cache id distinguished by if adding
-    * the LLVM function identifier. ACO is a built-in component in mesa, so no need
-    * to add aco function here.
-    */
 #if AMD_LLVM_AVAILABLE
-   if (!sscreen->use_aco &&
-       !disk_cache_get_function_identifier(LLVMInitializeAMDGPUTargetInfo, &ctx))
+   if (!disk_cache_get_function_identifier(LLVMInitializeAMDGPUTargetInfo, &ctx))
       return;
 #endif